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Yamaha YBR 125K, Owner'S Manual, Page: 60 / 83

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Yamaha YBR 125K Owner'S Manual Download Page 60

6-20

Drive chain slack adjustment

1. Locknut

2. Adjusting bolt

1. Loosen the rear brake pedal free play adjusting nut.
2. Loosen the axle nut.
3. Loosen the chain adjusting locknuts on each chain

puller. To tighten the chain, turn the chain adjusting nuts
in direction  

a

  .To loosen the chain turn the chain

adjusting nuts in direction  

b 

 and push the wheel

forward. Turn each chain adjusting nut exactly the same
amount to maintain correct axle alignment. There are
marks on each chain puller. Use these marks to align
the rear wheel.

Too little chain slack will overload the engine and other vital
parts. Keep the slack within the specified limits.
To maintain correct axle alignment, Ensure the notch on
the adjuster is on the same mark on left and right side

4. After adjusting, be sure to tighten each chain adjusting
locknut. The tighten the axle nut to the specified torque

Axle nut torque:

91 N.m (9.1 Kgf.m, 66 lbf.ft)

Locknut torque:

15 N.m (1.5 Kgf.m, 11 lbf.ft)

5. Adjust the free play in the brake pedal.

Check the operation of the brake light after adjusting
the rear brake.

CAUTION:

CAUTION:

6-20

Drive chain slack adjustment

1. Locknut

2. Adjusting bolt

1. Loosen the rear brake pedal free play adjusting nut.
2. Loosen the axle nut.
3. Loosen the chain adjusting locknuts on each chain

puller. To tighten the chain, turn the chain adjusting nuts
in direction  

a

  .To loosen the chain turn the chain

adjusting nuts in direction  

b 

 and push the wheel

forward. Turn each chain adjusting nut exactly the same
amount to maintain correct axle alignment. There are
marks on each chain puller. Use these marks to align
the rear wheel.

Too little chain slack will overload the engine and other vital
parts. Keep the slack within the specified limits.
To maintain correct axle alignment, Ensure the notch on
the adjuster is on the same mark on left and right side

4. After adjusting, be sure to tighten each chain adjusting
locknut. The tighten the axle nut to the specified torque

Axle nut torque:

91 N.m (9.1 Kgf.m, 66 lbf.ft)

Locknut torque:

15 N.m (1.5 Kgf.m, 11 lbf.ft)

5. Adjust the free play in the brake pedal.

Check the operation of the brake light after adjusting
the rear brake.

CAUTION:

CAUTION:

Summary of Contents for YBR 125K

Page 1: ...5YJ F8199 E0 OWNER S MANUAL YBR 125K YBR 125K YBR 125K YBR 125K YBR 125K ...

Page 2: ...g spare parts from a Yamaha dealer or reference in case the vehicle is stolen 1 FRAME SERIAL NUMBER II 2 ENGINE SERIAL NUMBER IDENTIFICATION NUMBERS RECORD Record the frame serial number and engine serial number in the spaces provided for assistance when ordering spare parts from a Yamaha dealer or reference in case the vehicle is stolen 1 FRAME SERIAL NUMBER ...

Page 3: ...ary 2003 All rights reserved Any reprinting or unauthorized use without the written permission of Yamaha Motor da Amazônia Ltda is expressly prohibited Printed in Brazil III YBR 125K OWNER S MANUAL 2003 Yamaha Motor da Amazônia Ltda 1st edition January 2003 All rights reserved ...

Page 4: ...intenance of this motorcycle If you have any questions about the operation or maintenance of your motorcycle please consult a Yamaha dealer YAMAHA MOTOR DA AMAZÕNIA LTDA IV INTRODUCTION Congratulations on your purchase of the YAMAHA YBR 125K This model is the result of Yamahaís vast experience in the production of fine sporting touring and pacesetting racing machines It represents the high degree ...

Page 5: ...ith it even if the machine is subsequently sold Yamaha continually seeks advancements in product design and quality Therefore while this manual contains the most current product information available at the time of printing There may be minor discrepancies between your machine and this manual If there is any question concerning this manual please consult your Yamaha dealer Particularly important i...

Page 6: ...ILLS WILL ENSURE THAT YOU SAFELY ENJOY THE CAPABILITIES AND THE RELIABILITY OF THIS MOTORCYCLE WARNING PLEASE READ THIS MANUAL CAREFULLY AND COMPLETELY BEFORE OPERATING THIS MACHINE DO NOT ATTEMPT TO OPERATE THIS MOTORCYCLE UNTIL YOU HAVE ATTAINED A SATISFACTORY KNOWLEDGE OF ITS CONTROLS AND OPERATING FEATURES AND UNTIL YOU HAVE BEEN TRAINED IN SAFE AND PROPER RIDING TECHNIQUES REGULAR INSPECTIONS...

Page 7: ...y the operator is veering wide on a turn due to EXCESSIVE SPEED or undercornering insufficient lean angle for the speed Never travel faster than warranted by conditions 4 Ride cautiously in unfamiliar areas You may encounter hidden obstacles which could cause an accident 5 The operatorís posture is important for proper control The operator should keep both hands on the handlebars and both feet on ...

Page 8: ...r visualization easier 7 Items above must also be followed by pillion rider MODIFICATION Modifications made to the machine not approved by Yamaha or the removal of original equipment may render your machine unsafe for use and may cause severe personal injury Modifications may also make your machine illegal to use PROTECTIVE APPAREL The majority of fatalities from machine accidents are the result o...

Page 9: ...he machine or the machine may become unstable in cross winds These accessories may also cause instability when being passed by or passing large vehicles c Certain accessories can displace the operator from his or her normal riding position This improper position limits the freedom of movement of the operator and may limit control ability Therefore such accessories are not recommended 2 Caution mus...

Page 10: ... type ìOFFî for manual type If it should lean over gasoline may leak out of the carburetor or fuel tank 5 If you should swallow any gasoline inhale a lot of gasoline vapor or allow gasoline to get in your eyes see your doctor immediately If any gasoline spills on your skin or clothing immediately wash it off with soap and water and change your clothes GASOLINE AND EXHAUST GAS 1 GASOLINE IS HIGHLY ...

Page 11: ... XI PRE OPERATION CHECKS 4 1 Engine oil 4 3 Tires 4 3 Fitting Fasteners 4 6 Switches 4 6 Wheels 4 6 Fuel 4 7 OPERATION AND IMPORTANT RIDING POINTS 5 1 Starting a cold engine 5 2 Starting a warm engine 5 2 Warming up the engine 5 2 Shifting 5 3 Tips for reduccing fuel consumption 5 4 Engine Break in 5 4 Parking 5 5 CONTENTS DESCRIPTION 1 1 MACHINE IDENTIFICATION 2 1 Vehicle identification number 2 ...

Page 12: ...stand 6 22 Front fork inspection 6 23 Steering inspection 6 24 Wheel bearings 6 24 Battery 6 25 Replenishing the battery fluid 6 26 Storage the battery 6 27 Fuse replacement 6 27 Headlight bulb replacement 6 28 Turn signal bulb replacement 6 30 Taillight bulb replacement 6 30 Front wheel removal 6 31 Front wheel installation 6 32 Rear wheel removal 6 32 Rear wheel installation 6 33 Troubleshooting...

Page 13: ...06 Shift pedal 07 Shock absorber 08 Air filter 09 Kick stater 10 Dispstick 11 Rear brake pedal 12 Clutch lever 13 Handlebar switches over right 14 Speedometer 15 Main switch 16 Fuel gauge 17 Front brake lever 18 Throttle 10 Handlebar switches over left 20 Fuel tank cap DESCRIPTION ...

Page 14: ...ial number NOTE Model code is indicated by 4th to 8th A digits and serial number is indicated by 12th to 17th digits B Record these numbers for reference in case of ordering parts from a Yamaha dealer MACHINE IDENTIFICATION A B Vehicle identification number The vehicle identification number is stamped into the steering head pipe Record this number in the space provided Engine serial number The eng...

Page 15: ...efer to page 3 11 ìSteering lockî for instructions NOTE Always turn the main switch to ìOFFî or ìLOCKî and remove the key when the motorcycle is unattended CONTROL FUNCTIONS Main switch The main switch controls the ignition and the electrical system Itís operation is described below ON Electrical circuits are switched on Engine can be started The key cannot be removed OFF All electrical circuits a...

Page 16: ...en the transmission is in neutral Indicator lights 1 Turn indicator lights 2 High beam indicator light 3 Neutral indicator light N Turn indicator lights The corresponding indicator fhashes when the turn switch is moved to the ì ì or ì ì High beam indicator light This indicator comes on when the headlight high beam is used Neutral indicator light N This indicator comes on when the transmission is i...

Page 17: ...level decreases When the needle reaches the ìRED ZONEî refill the tank at the earliest opportunity NOTE The fuel meter needle does not move when the main switch is in ìOFFî position The speedometer shows riding speed This speedometer is equipped with an odometer 1 Adjustind knob 2 Odometer 1 Fuel gauge Fuel gauge Speedometer 1 Adjustind knob 2 Odometer 1 Fuel gauge ...

Page 18: ...t hand turn push the switch to ì ì Once the switch is released it will return to the center position To cancel the signal push the switch in after it has returned to the center position HORN SWITCH Press the switch to sound the horn Handlebar switches over left 1 Light switch 2 Pass switch 3 Dimmer switch 4 Turn signal switch LIGHTS SWITCH Turning the light switch to ì ì turns on the meter lights ...

Page 19: ...rottle system Turn the switch to ì î to start the engine and turn the switch to ì î to stop the engine Handlebar switches over rigt 1 ìENGINE STOPî switch shuts the engine off ENGINE STOP switch The engine stop switch is a safety device for use in an emergency such as when the motorcycle overturns or if trouble occurs in the throttle system Turn the switch to ì î to start the engine and turn the s...

Page 20: ...hould be pulled rapidly and released slowly for smooth clutch operation 3 6 This motorcycle is equipped with a constant mesh 5 speed transmission The shift pedal is located on the left side of the engine and is used in combination with the clutch when shifting Clutch lever Shift pedal 1 Clutch lever 1 Shift pedal Clutch lever Shift pedal 1 Clutch lever 1 Shift pedal ...

Page 21: ... apply the front brake 3 7 The rear brake pedal is on the right side of the motorcycle Press down on the brake pedal to apply the rear brake Front brake lever Rear brake pedal 1 Front brake lever 1 Rear brake pedal Front brake lever Rear brake pedal 1 Front brake lever 1 Rear brake pedal ...

Page 22: ...osition Be sure the cap is properly installed and locked in place before riding the motorcycle WARNING Fuel tank cap TO OPEN Insert the key and turn it 1 4 turn clockwise The lock will be released and the cap can be opened TO CLOSE Push the tank cap into position with the key inserted To remove the key turn it counterclockwise to the original position Be sure the cap is properly installed and lock...

Page 23: ... of fuel while riding set the fuel cock to this position Fill the tank at the first opportunity be sure to set fuel cock back to ìONî after refueling Fuel cock The fuel cock supplies fuel from the tank to the carburetor while filtering it also The fuel cock has three positions OFF With the fuel cock in this position fuel will not flow Always set the fuel cock to this position when the engine is no...

Page 24: ...ine has warmed up push the knob down to close the circuit 3 10 Starter lever Rotate the kick starter away from the engine Push the starter down lightly with your foot until the gears engage then kick smoothly and forcefully to start the engine Shift to neutral before starting Kick starter 1 Starter lever 1 Kick starter Starter lever Kick starter 1 Starter lever 1 Kick starter ...

Page 25: ...To release the lock turn the key to ìOFFî Never turn the key to LOCK position when the motorcycle is moving WARNING LOCK OFF PUSH Steering lock The steering is locked when the main switch is turned to ìLOCKî To lock the steering turn the handlebars all the way to the left With the key at ìOFFî position push it into the main switch and release it turn it counterclockwise to ìLOCKî and remove the ke...

Page 26: ... insert the lobe into the receptacle on the frame then tighten the bolts Reinstall the side covers Seat To remove the seat remove the side covers see page 3 13 then remove the bolts and release the lobe from the rear portion of the frame To reinstall the seat insert the lobe into the receptacle on the frame then tighten the bolts Reinstall the side covers Seat ...

Page 27: ...ward 2 To reinstall reverse the removal procedures 3 13 Remove the key nad then pull the cover towards yourself 1 to release the fitting pin and then pull it forward 2 To reinstall reverse the removal procedures Side covers 1 Pull 2 Pull forward 1 Pull 2 Pull forward Side covers 1 Pull 2 Pull forward 1 Pull 2 Pull forward ...

Page 28: ...tting Uneven adjustment can cause poor handling and loss of stability 1 2 3 4 5 6 7 Adjusting position Soft Standard Hard CAUTION Rear shock absorber adjustment 1 Spring preload adjusting ring 2 Position indicator Each shock absorber is equipped with a spring preload adjusting ring Adjust spring preload as follows Turn the adjusting ring in direction a to increase spring preload and in direction b...

Page 29: ...ire pressure wear damage and spoke tightness Check for smooth operation Lubricate if necessary 6 16 6 18 6 14 6 22 4 3 6 6 6 9 6 19 6 21 6 10 6 11 4 3 4 6 6 31 6 33 6 21 Check operation condition and free play Adjust if necessary Wheels Tires Clean and oil it frequently 6 18 Brakes 4 1 PRE OPERATION CHECKS Before using this motorcycle check the following points ITEM ROUTINE PAGE Check operation co...

Page 30: ...ten Adjust if necessary Check fuel level top up as required Fuel tank Lights signals and switches Battery Check electrolyte level Replenish with ìdistilled waterî if necessary 6 22 4 6 6 5 4 6 6 28 6 30 6 25 6 27 6 22 4 7 Check for proper operation Front brake and clutch lever pivots Check for smooth operation Lubricate if necessary Check for smooth operation Lubricate if necessary 6 22 Check for ...

Page 31: ...rider passenger and accessories fairing saddlebags etc if approved for this model and vehicle speed WARNING OIL QUANTITY Total amount 1 2 L 0 264 Imp gal 0 317 US gal Periodic oil change 1 0 L 0 220 Imp gal 0 264 US gal Engine oil See page 6 6 for details Make sure the engine oil is at the specified level Add oil as necessary Check the oil level in a daily manner and top it up if CAUTION Tires To ...

Page 32: ...does not exceed the maximum load of the motorcycle Operation of an overloaded motorcycle could cause tire damage an accident or even injury WARNING Basic weight With oil and without fuel Maximum load Cold tire pressure up to 90 Kg 198 lb load 90 Kg 198 lb maximum load 116 Kg 256 lb 160 Kg 353 lb Front Rear Load is the total weght of cargo rider passenger and accessories 1 75 kg cm2 25 PSI 175 kpa ...

Page 33: ...n this motorcycle Front Rear Size Manufacturer Type Minimum tire tread depth from and rear 0 8 mm 0 032 in 2 75 18 PIRELLI 42P MT 39 90 90 18 PIRELLI 57P MT 15 WARNING 2 Tire inspection Always check the tires before operating the motorcycle If a tire tread shows crosswise lines minimum tread depth if the tire has a nail or glass fragments in it or if the side wall is cracked contact a Yamaha deale...

Page 34: ...alanced can result in poor performance adverse handling characteristics and shortened tire life 3 After installing a tire ride conservatively to allow the tire to seat itself on the rim properly Failure to allow proper seating may cause tire failure resulting in damage to the motorcycle and injury to the rider 1 It is dangerous to ride with a worn out tire When the tire tread begin to show signs o...

Page 35: ...ber of 91 or higher If knocking or pinging occurs use a different brand of gasoline or premium unleaded fuel Unleaded fuel will give you longer spark plug life and reduced maintenance cost If unleaded gasoline is not available then leaded regular gasoline can be used Gasohol There are two types of gasohol gasohol containing ethanol and that containing methanol Gasohol containing ethanol can be use...

Page 36: ...lways be sure the sidestand is up Failure to retract the sidestand completely can result in a serious accident when you try to turn a corner CAUTION CAUTION 1 Be very careful if you are carrying object while riding the motorcycle 2 Be vareful not to put any object near battery terminals Electrical failure or acid corrosion may occur OPERATION AND IMPORTANT RIDING POINTS Before riding this motorcyc...

Page 37: ...gine life always warm the engine up never accelerate hard while the engine is cold To check if engine temperature is normal rev the engine with the choke closed and check to see if it responds normally CAUTION See the ìBreak in sectionî prior to operating the motorcycle for the first time Starting a cold engine 1 Turn the fuel cock to ìONî 2 Turn the main switch to ìONî and the engine stop switch ...

Page 38: ...nd of its travel you will feel a stop when you are in first gear then raise the pedal slightly CAUTION 1 Do not coast for long periods with the engine off and do not tow the motorcycle a long distance Even with gears in neutral the transmission is only properly lubricated when the engine is running Inadequate lubrication may damage the transmission 2 Always use the clutch when changing gears The e...

Page 39: ...tion Vary the speed of the motorcycle from time to time Do not operate it at one set throttle position Tips for reducing fuel consumption Your motorcycleís fuel consumption depends to a large extent on your riding style The following tips can help reduce fuel consumption 1 Warm up the engine before riding 2 Turn off the starter lever as soon as possible 3 Shift up swiftly and avoid high engine spe...

Page 40: ...r children are not likely to touch the motorcycle Do not park the motorcycle on a slope or soft ground the motorcycle may fall over CAUTION CAUTION WARNING 2 150 500 Km Avoid prolonged operation above 1 2 throttle Allow the machine to rev freely through the gears but do not use full throttle at any time 3 500 1 000 Km Avoid cruising speeds in excess of 3 4 throttle After 1 000Km of operation be su...

Page 41: ...ustment and lubrication are explained in the following pages If you are not familiar with motorcycle service this work should be done by a Yamaha dealer CAUTION PERIODIC MAINTENANCE AND MINOR REPAIRS Perodic inspection adjustment and lubrication will keep your motorcycle in the safest and most efficient condition possible Safety is an OBLIGATION of the motorcycle owner The maintenance and lubricat...

Page 42: ...n the ownerís tool kit are to assist you in the performance of periodic maintenance However some other tools such as a torque wrench are also necessary to perform the maintenance correctly 1 Tool kit WARNING NOTE If you do not have necessary tools required during a service operation take your motorcycle to a Yamaha dealer for service Modifications to this motorcycle not approved by Yamaha may caus...

Page 43: ...ry 12 000 km or 12 month Check rear arm assembly for looseness Moderately repack EVERY 3 000KM OR ERERY 6 MONTHS Wheels and tires Check tire pressure runout and spoke tightness Spark plug Check condition and clean if necessary Replace if necessary every 12 000 Km 3 000KM PERIODIC MAINTENANCE LUBRICATION Battery Check electrolyte level routing breather pipe ITEM How it sounds Adjust if necessary RE...

Page 44: ...essary Check and looseness REMARKS 1 000KM Lights and flashers Nuts and bolts Motorcycle Aspect Check operation Check tighten General Check EVERY 3 000KM OR EVERY 3 000KM Check operation oil leakage Every 500 Km ITEM Front forks Centerstand and sidestand Control cables throttle clutch front brake Rear shock absorber Drive chain Fittings fasteners Check operation oil leakage Check operation loosene...

Page 45: ...mm 22 mm B Bolt 6 mm 8 mm 10 mm 12 mm 14 mm 16 mm General torque especifications Nm 6 15 30 55 85 130 kgf m 0 6 1 5 3 0 5 5 8 5 13 0 lbf ft 4 3 11 22 40 61 94 lbf ft 9 0 14 5 5 0 32 5 66 Torque specifications Use a torque wrench to tighten these items It is recommended that these items be checked occasionally specially before a long trip Always check the tightness of these items whenever they are ...

Page 46: ...er cap dispstick clean it with a dry cloth and check the oil level NOTE To check the oil level the oil filler cap dispstick can not be screwed just lightly seated in place d The oil level should be between the maximum and minimum marks If the level is low add oil to raise it to the indicated level check for oil leakage 1 Engine oil filler cap Engine oil 1 Oil level measurement a Place the motorcyc...

Page 47: ...o the specified torque Tightening torque Drain plug 20 N m 2 0 kgf m 14 5 lbf t 1 Dipstick 1 Engine oil drain plug 2 Engine oil and filter replacement a Warm up the engine for a few minutes b Stop the engine Place an oil pan under the engine and remove the dipstick c Remove the drain plug and drain the oil d Reinstall the drain plug check if the gasket is damaged and tighten it to the specified to...

Page 48: ... oil pressure Oil quantity Total amount 1 2 L 0 264 Imp gal 0 317 US gal Periodic oil change 1 0 L 0 220 Imp gal 0 264 US gal Recommended oil Yamalube 4 CAUTION CAUTION CAUTION e Fill engine with oil Install the oil filter cap and tighten NOTE Do not put in any chemical additives Engine oil also lubricates the clutch and additives could cause clutch slippage Be sure no foreign material enters the ...

Page 49: ...ghten the check bolt to the specified torque Check bolt torque 7 N m 0 7 Kgf m 5 0 lbf ft 1 Check bolt Oil pressure 1 Remove the check bolt 1 in the cylinder head 2 Start the engine and keep it idling until oil flows out of the bleed hole If no oil comes out after one minute turn off the engine immediately so it will not seize In such a case go to the nearest Yamaha dealer or other qualified mecha...

Page 50: ...he air filter case cover by removing the bolts 3 Remove the clamp 4 Remove the air filter from the case Air filter The air filter should be cleaned at the specified intervals It should be cleaned more frequently if you are riding in unusually wet or dusty areas 1 Remove the right side cover pag 3 13 2 Remove the air filter case cover by removing the bolts 3 Remove the clamp 4 Remove the air filter...

Page 51: ...ke sure the element is properly seated in the air filter case The engine should never be run without the air filter element installed excessive piston and or cylinder wear may result 6 11 CAUTION CAUTION 5 Remove the air filter elements from the guide and clean them with solvent After cleaning remove the remaining solvent by squeezing the air filter 6 Apply recommended oil to the entire surface of...

Page 52: ...after many tests If the settings are changed poor engine performance and damage may result 6 12 CAUTION Valve clearance adjustment The correct valve clearance changes with use resulting in improper fuel air supply or engine noise To prevent this valve clearance must be adjusted regularly This adjustment however should be left to a professional Yamaha service technician Carburetor adjustment The ca...

Page 53: ...idle speed cannot be obtained by performing the above adjustment consult a Yamaha dealer 6 13 Standard idle speed 1 300 1 400 r min 1 Throttle stop screw Idle speed adjustment NOTE A diagnostic tachometer must be used for this procedure 1 Attach the tachometer Start the engine and warm it up for a few minutes normally 1 or 2 minutes at approximately 1 000 to 2 000 r min Occasionally rev the engine...

Page 54: ...es free play 3 Tighten the locknut 6 14 Free play 3 7 mm 0 12 0 28 in Throttle cable adjustment 1 Free play 2 Locknut 3 Adjuster NOTE Before checking the throttle cable free play the engine idling speed should be adjusted The throttle cable should have an specified free play in the turning direction at the grip flange If the free play is incorrect follow the instructions below 1 Loosen the locknut...

Page 55: ...Before installing the spark plug measure the electrode gap with a wire thickness gauge and adjust the gap to specification as necessary Spark plug gap 0 7 mm 0 028 in When installing the plug always clean the gasket surface and use a new gasket Wipe off any grime from the threads and torque the spark plug properly Spark plug torque 12 5 N m 1 25 Kgf m 9 lbf ft NOTE If a torque wrench is not availa...

Page 56: ...jor adjustment may be made at adjusting bolt wich is located besides the front brake shoe plate 5 To complete the adjustment turn the adjusting bolt clockwise until appropriate freeplay is obtained Cheking the brakes shoes 1 Wear limit line 2 Wear indicator Apply the brake and inspect the wear indicator If the indicator reaches the wear limit line ask a Yamaha delaer to replace the shoes Front bra...

Page 57: ...e this adjustment Check the operation of the brake light after adjusting the rear brake 1 Adjusting nut CAUTION Rear brake adjustment a Free play 20 30 mm 0 8 1 2 in Check the free play the rear brake pedal free play should be adjusted to 20 30 mm 0 8 1 2 in at the brake pedal end Turn the adjusting nut in direction a to increase free play and in direction b to decrease free play Press the brake p...

Page 58: ...Clutch adjustment The clutch lever free play should be adjusted to 10 15 mm 0 4 0 6 in at the clutch lever end If the free play is incorrect adjust as follows 1 Loosen the lock nut at the handlebar 2 Turn the adjuster in or out until proper lever free play is obtained 3 Tighten the lock nut 4 If the free play is still incorrect make an adjustment at the crankcase side NOTE If proper adjustment can...

Page 59: ...ack is approximately 20 30 mm 0 8 1 2 in If the slack exceeds 30 mm 1 2 in adjust a 20 30 mm 0 8 1 2 in Drive chain slack check NOTE Spin the wheel several times and find the tightest position of the chain Check and or adjust the chain slack while it is in this tightest position To check the chain slack the motorcycle must be held straight up with both wheels on the ground and without rider Check ...

Page 60: ...notch on the adjuster is on the same mark on left and right side 4 After adjusting be sure to tighten each chain adjusting locknut The tighten the axle nut to the specified torque Axle nut torque 91 N m 9 1 Kgf m 66 lbf ft Locknut torque 15 N m 1 5 Kgf m 11 lbf ft 5 Adjust the free play in the brake pedal Check the operation of the brake light after adjusting the rear brake CAUTION CAUTION Drive c...

Page 61: ...ricate the inner cable and the cable end If it does not operate smoothly ask a Yamaha dealer to replace them RECOMMENDED LUBRICANT Engine oil SAE 20W50 WARNING Drive chain lubrication The chain consists of many parts which work with each other If the chain is not maintained properly it will wear out quickly Therefore the chain must be serviced regularly This service is especially necessary when ri...

Page 62: ...nd Lubricate the pivoting parts Check to see that the sidestand moves up and down smoothly RECOMMENDED LUBRICANT Engine oil SAE 20W50 WARNING If the sidestand does not move smoothly consult a Yamaha dealer CAUTION Throttle cable and grip lubrication The throttle twist grip assembly should be greased at the time the cable is lubricated since the grip must be removed to get at the end of the throttl...

Page 63: ...ont fork consult a Yamaha dealer Front fork inspection Securely support the motorcycle so there is no danger of it falling over CAUTION WARNING 1 Visual check Check for scratches or damage on the inner tube and excessive oil leakage from the front fork 2 Operation check Place the motorcycle on a level place a Hold the motorcycle in an upright position and apply the front brake b Push down hard sev...

Page 64: ...e motorcycle so there is no danger of it falling over Wheel bearings If there is play in the front or rear wheel hub or if the wheel does not turn smoothly have a Yamaha dealer inspect the wheel bearings The wheel bearings should be inspected according to the Maintenance Schedule Steering inspection WARNING Periodically inspect the condition of the steering Worn out Wheel bearings If there is play...

Page 65: ...eather hose goes through the hole Battery breather hose passes in front of the frame and indicated axle Hose junction holds the breather hose BATTERY BREATHER HOSE ROUTING Battery Check the level of the battery electrolyte and make sure that the terminals are tight Add distilled water if the electrolyte level is low 1 When inspecting the battery make sure that the battery breather pipe routing is ...

Page 66: ...h The level should be between the minimum and maximum marks Use only ìdistilled waterî if refilling is necessary Normal tap water contains minerals which are harmful to a battery therefore refill only with distilled water Replenishing the battery fluid 1 Maximum marks 2 Minimum marks CAUTION WARNING Battery electrolyte is poisonous and dangerous causing severe burns etc It contains sulfuric acid A...

Page 67: ...the electrical device operates If the fuse immediately blows again consult a Yamaha dealer WARNING Do not use fuses of higher amperage rating than those recommended Substitution of a fuse of improper rating can cause extensive electrical system damage and possibly a fire FUSE CAPACITY 10 A Fuse replacement 1 Fuse 2 Reserve CAUTION Storage the battery 1 When the motorcycle is not used for a month o...

Page 68: ...rs and remove the rubber cover 3 Turn the bulb socket counterclockwise and remove the bulb Keep flammable products and your hands away from the bulb while it is on as it is hot Do not touch the bulb until it cools down 1 Rubber cover CAUTION 1 Screw Headlight bulb replacement 2 Loosen the bulb connectors and remove the rubber cover 1 Rubber cover ...

Page 69: ...ulb to keep it free from oil otherwise the transparency of the glass the life of the bulb and the luminous flux will be adversely affected If the headlight bulb gets soiled thoroughly clean it with a cloth moistened with alcohol or lacquer thinner WARNING 1 Bulb 4 Put a new bulb install the socket and the bulb rubber cover 5 Reconnect the connectors 6 Reinstall the headlight assy If it is necessar...

Page 70: ...he bulb inward and turn it counterclockwise 3 Place a new bulb in the socket 4 Install the lens CAUTION Turn signal bulb replacement 1 Remove the screws and the lens 2 Push the bulb inward and turn it counterclockwise 3 Place a new bulb in the socket 4 Install the lens and the screws Do not over tighten the screws as the lens may break Taillight bulb replacement 1 Remove the lens 2 Push the bulb i...

Page 71: ...ve the speedometer cable by loosening the cable clip 4 With the help of ar appropriete tool completely loose the axle nut and remove it 1 Lock nut 2 Clip 3 Axle nut CAUTION Front wheel removal 1 Place the motorcycle on the centerstand 2 Loosen the front brake cable by loosening the adjusting bolt 3 Remove the speedometer cable by loosening the cable clip 4 With the help of ar appropriete tool comp...

Page 72: ...properly torqued Axle nut torque 45 N m 4 5 Kgf m 32 5 lbf ft Rear wheel removal It is advisable to have a Yamaha dealer service the wheel Securely support the motorcycle so there is no danger of it falling over 1 Place the motorcycle on the centerstand 2 Remove the cotter pin and nut Then remove the tension bar from the brake shoe plate 1 Nut 2 Cotter pin 3 Tension bar CAUTION Front wheel install...

Page 73: ...orque 91 N m 9 1 Kgf m 66 lbf ft Tension bar nut 19 N m 1 9 Kgf m 14 lbf ft 3 Adjust the rear brake Check the operation of the brake light after adjusting the rear brake CAUTION 3 Remove the brake adjusting nut and brake rod from 1 Adjusting Nut 2 Brake Rod 3 Axle Nut Rear wheel installation When installing the rear wheel reverse the removal procedures Pay attention to the following points 1 Adjus...

Page 74: ...are often inferior Consequently they have a shorter service life and can lead to expensive repair bills Troubleshooting Although Yamaha motorcycles receive a rigid inspection before shipment from the factory trouble may occur during operation Any problem in the fuel compression or ignition systems can cause poor starting and loss of power The troubleshooting chart describes a quick easy procedure ...

Page 75: ...rk plug gap or replace spark plugs Ask Yamaha dealer to inspect Troubleshooting chart Go to compression check Engine doesnít start go to compression check Open the throttle hal way and start the engine Engine doesnít start go to battery check WARNING Never check the fuel system while smoking or in the vicinity of an open flame Check if there is fuel in the fuel tank Use electric starter 1 Fuel 2 C...

Page 76: ...7 Clean the seat with a vinyl upholstery cleaner to keep the cover pliable and glossy 8 Automotive type wax may be applied to all painted and chrome plated surfaces Avoid combination cleaner waxes Many contain abrasives which may mar the paint or protective finish When finished start the engine and let it idle for several minutes CAUTION CAUTION CLEANING AND STORAGE A CLEANING Frequent thorough cl...

Page 77: ...nd charge it Store it in a dry place and recharge it once a month Do not store the battery in an excessively warm or cold place less than 0 C 30 F or more than 30 C 90 F NOTE Make any necessary repairs before storing the machine B STORAGE Long term storage 30 days or more of your machine will require some preventive procedures to guard against deterioration After thoroughly cleaning the machine pr...

Page 78: ...adius 1 750 mm 70 in Engine Type Air cooled 4 stroke gasoline SOHC Cylinder arrangement Single cylinder Forward inclined Displacement 123 7 cm3 Bore x Stroke 54 x 54 mm 2 13 x 2 13 in Compression rate 10 0 1 Starting system Kick starter Lubrication system Wet sump SPECIFICATIONS MODEL YBR 125K Dimension Overall length 1 980 mm 78 in Overall width 745 mm 29 in Overall height 1 050 mm 41 in Seat hei...

Page 79: ...k capacity 13 L 2 860 Imp gal 3 434 US gal Reserve amount 1 7 L 0 374 Imp gal 0 450 US gal Carburetor Type manufacturer VM 20 MIKUNI Spark plug Type manufacturer CR7HSA NGK or U22FSR U DENSO Gap 0 7 mm 0 028 in Clutch type Wet multi disc 8 2 MODEL YBR 125K Engine oil Type Yamalube 4 or SAE 20W50 type SH Capacity Periodic oil change 1 0 L 0 220 Imp galt 0 264 US gal Total amount 1 2 L 0 264 Imp gal...

Page 80: ... 18 3rd 25 19 4th 23 22 5th 21 24 Chassis Frame type Diamond Caster angle 26 20î Trail 103 mm 4 0 in Tire Type With tube Size Front 2 75 18 42P MT39 Rear 90 90 18 57P MT15 MODEL YBR 125K Transmission Primary reduction system Spur gear Primary reduction rate 68 20 Secondary reduction system Chain drive Secondary reduction rate 45 14 Transmission type Constant mesh 5 speed Operation Left foot operat...

Page 81: ...nt Coil spring Oil damper Rear Gas Coil spring Oil damper Front 120 mm 5 0 in Rear 105 mm 4 0 in Electrical Ignition system CDI Generator system AC Magneto generator Battery type capacity 12N 5 5 3B 12V 5 5 Ah MODEL YBR 125K Brakes Front brake type Drum brake Operation Right hand operation Rear brake type Drum brake Operation Right foot operation Suspension Front Telescopic fork Rear Swingarm New ...

Page 82: ... wattage x quantity Panel 12V x 3 4W 2pc Neutral lamp 14V x 3W 1pc Headlight 14V x 3W 1pc Flasher light 14V x 3W 2pc MODEL YBR 125K Headlight type Halogen bulb Bulb wattage x quantity Headlight 12V 35w 35w 1pc tail Brake light 12V 5w 21w 1pc Flasher light 12V 10w 4pc Indicator light wattage x quantity Panel 12V x 3 4W 2pc Neutral lamp 14V x 3W 1pc Headlight 14V x 3W 1pc ...

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